Gripping lamp and fuse holder



Dec. 16, 1924 1,519,774' l V n. E BERHARDT GMPPING LAMP AND FUSE HOLDER Filed April 26, 1925 Patented Dec. 16, 1924i.

ETE. STATES ROBERT EBERHARDT, OF NEVV YORK, N. Y.

GRIPPING LAMP AND FUSE HOLDER.

Application led April 26, 1923.

T all 10710711 'it vmay concern.'

Be it known that I, ROBERT Eennrraiznr, a citizen of Hungary, residing at New York. in the county of New York and State of New York, have invented certain new and useful Improvements in @ripping Lamps and Fuse Holders, of which the following is a specification.

This invention relates generally to electric incandescent lamps, having more particular reference to the construction of the screw threaded member in the socket element into which the rear end of the lamp bulb is screwed, the invention being also adapted for use in connection with fuse sockets.

The invention has for au object the provision of an improved means, of simple and inexpensive construction, whereby the bulb may be more quickly attached to the said screw threaded member.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

Fig. 1 of the drawings is a side view of an electric incandescent lamp having the invention applied to its socket member.

Fig. 2 is a partial elevational view at right angles to Fig. 1, the shell being shown in section and the interior parts in elevation.

Fig. 3 is a horizontal sectional view taken on the line 3--3 of Fig. 2.

Fig. 4l is a like view taken on the line 4 4 of Fig. 2.

Fig. 5 is a similar view to Fig. 4 but showing a somewhat modified construction. Fig. 6 is a fragmentary elevation showing a means for locking the lamp in place.

In the drawings the reference number 10 indicates the shell of the socket member of the lamp, the usual bulb being indicated at 11 and the switch button at 12. rlhs shell l0 is provided with the usual insulating lining 18. According to this invention the sleeve which grips the bulb end is of expansible construction, whereby the bulb can be more readily attached or removed,

As here shown this sleeve is divided diametrically into two halves or sections 15 and 16 respectively, which are formed with screw threads complementary to one another,

Serial No. 634,785.

these sections being formed with inturucd iianges 15 and 16 at their lower edges and are formed with hinge ears 18 and 19 adjacent their inner ends which surround a hinge pintle 20 extending longitudinally in the socket adjacent one side thereof, and which is supported by the usual porcelain block 21 which carries the switch mechanisi rl`he hinge ears 18 freely surround the pintle 20, while the ears 19 are lixed thereto. One of the ears 18 has an integral extension 1S to which is fixed a lateral arm 23, while the pintle 20 has iixed thereto another lateral arm 24.

These arms project from the side of the socket, generally toward the centre thereof, and their free ends are positioned on opposite sides of an oval disk 26 which is rotatably supported in the socket, being fixed on a stud 27 which extends in the median line of the socket and which projects from the porcelain block 21. This disk 26 forms a cam by whose partial rotation the arms 223, 24- are moved to open the two parts 15 and 16. To rotate this cam it has xed co-axially thereto a gear 29 engaged on opposite side.1 by a pair of rack bars 30 slidable in suitable guide members 31 in the shell 10 and each projecting at one end through the latter and having a push button 30 on its outer end. These rack bars have connected thereto the tension springs 32 whereby they are returned to normal position.

Surrounding the extended ,lower end of the hinge pintle 2O is a coiled spring 34 which both serves to support the members 15, 16 and to urge the same toward one another to grip the bulb end, the spring be ing connected at opposite ends respectively to the pintle 2O and the member 15., which is freely engaged with said pintle.

As will be apparent, when it is desired to attach a bulb to the socket it is only necessary to press the buttons 30 in unison, which will rotate cani Q6 and cause the arms 23, 24 to swing away from one another, and since each arm has a hxed connection with one of the members 15, 16 the latter will be caused to likewise swing away from one another so that the bulbi end can be rcadilj-.f inserted. When the buttons are released the spring 34 urges the two members 15, 16 toward one another, causing them to grip and hold the bulb end. For making the electrical connections the upper end of the pintle 20 may be engaged in any suitable manner with one of the lead Wires, lWhile an angular member 36 `is extendedthrough the porcelain block 21 to be engaged at one end with the other lead Wire and atits opposite end with the usual centre contact on the bulb end. spring fingers l5a and 16a which clasp the members l5 and 16 to urgef'tlic'm towardone another.

In 5v 'I have shown an.arrangement in which" the two members l5, 16' are liorin-ed onone side With" orossedlfingers 40,451 which project through suitable slots 42 in the Wall of the shell and which" arefmo-ved`lr toward i one another to open thelbulb'engaging parts,-l it being understood that the spring urges these parts together" as inthe other con# struction.`

AS sh'ci'vn) in 61 may monnt a rotary cam 43T on the shell lOib'e-tiveen the' fingers 40 andy all1 and `whichV is locked" by asuitable key'ins'erted through a leyshole @if therein to prevent expansion of the bulb holding member', the inturned" flanges* i5" and 16 thenl preventing Withdr'a`\val ofE the bulb'.`

Having'thus described my invention what I claimy as new4 and desire to protectby Letters Patent of the United States lisA asf'ollovvs':

l. In an' electricsocliena casing an' expansible bulb holding member insaidl casing, said'KL member'being'` in the' form of a sleeve formed' in tw'o semi`-c'ylndricalr sections, means hinging the-said sectionsV Within the casing, arms'fixed to the respective sections, and" a'rotary camy memberadapted to'engage each arm' to'enpandj the said" bulblholding member.'

2. In' an' electric' socket, a casing, an expansible' bulb'lolding member' in said casing, said member being'in the formt of al sleeve formed in 4tvvo seniiscylindiical sections, means liinginff'l the said sections'within the casing, arms five' d' to the respective sections, and a rotary cam member adapted toengage each' arm toK4 expand the saidl bulb holding' member, and gear and rack means 'for rotating'lsaid cam.

3. In anel'ectric socket, anoxpansibl'cbulb holding member in the form off a sleeve formedv in tivo seam-cylindrical? sections, hinge ear's on the respective sections, a hinge pintle freelyl engaged' Withfthe ears on one section and' fixed to the ears' on the other section, pair of arms projecting respec tively from the hinged pintl'e and the first named ears, and a cam for operating' said arms to open the said bulb hol'dingmember.

4f. In an electric socket, an eXp-ansibl'e bulbholding member in the form of'a sleeve I may also provide af pair of,`

forinedf in two semi-cylindrical. sections, hinge earson the-respective sections, a hinge p-intle freely engaged with the ears on one section and fixedto the ears on the other section, a pair of'arms projecting respeo tively from'the'hinged pintle and the first named ears, and a cam for operating said arms-"to-openithe said bulb holding member, said cam being in the form of an oval disk adapted for partial rotation.

y 5.l VInanelectric socket, an expansible bulb holding` member in the form of." a sleeve formed' in tWosemi-cylindrical sections, hingeears on the respectivesections, ahinge pin-tlc freely engaged with the' ears on one section and fixed tothe ears on the other section, a pair of arms projecting respectively" from the hinged? pintleA andE the, first named ears,andf a oa-m for operating: said arms'tofope'nthe saidb-ulbholding member, saidcam being in the form ofg an oval? disk adapted for partialy rotation, a gear xed co-axially to said disk and manually operable racha` bars engaging'saidx gear torotate the latter in one direction,

6. In anl electric socket, air expansible bnlbl holding member in the form of* a sleeve formedA in tWo'- semiscylindrical sec-- tions, hingeearson the' respective sections, a hinge pintle freelyl engaged" xvithtlie ears on one section andffixed tothe-ears on the other section, a pair of arms projecting respectively from thev hinged' pintfle and; the first named ears,- and a cam' for operating said' arms to open1 the saidy bulb holding member, said cam being in the form of an oval disk adaptedg for partial rotation', a gear''fixed co-aX-ially'to said d'isl and manually operable rack bars@ engaging said gear to rotate the latter in one direction, and Springs connected to said rack bars whereby the latter are moved inv an opposite' direction.

7. In an electric socket, an expansiblebulb holding member' in the form of a sleeve formed in tvvo semicylindricajl sections, hinge ears-on'tlierespective sections, a1 hinge pintle freely engaged with the ears on one section and fined to: thel earson the other section, apair of arms projecting respectively from the hingedI pintle and the first named ears, andl a; cam forv operating said arms to open the said bulb holding member, and asprng engaged? at one end with said pintle and at its other end" With one of the first named ears andl acting to contract said bulb holding member.'

In testimony Whereofl have affixed my signature.

ROBERT EBER'I'IARIDT. 

